/*
    This file is part of the substandard lisp implementation of Standard Lisp
    Copyright (C) 2011 Nicky Nickell

    substandard lisp is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

(de sublis (x y)
  (cond
    ((null x) y)
    (T (prog (u)
        (setq u (assoc y x))
        (return
          (cond
            ((not (null u)) (cdr u))
            ((atom y) y)
            (T (cons (sublis x (car y)) (sublis x (cdr y))))))))))

/*---
name: sublis

doc: |
  explaining what sublis is / how it is used!

tests: |
  (setq l (pair '(a b c) '(1 2 3)))
  (sublis l 'a) -> 1
  (sublis l 'b) -> 2
  (sublis l 'c) -> 3
  (sublis l 'd) -> d
...*/
